Which of the following are the three primary types of wood used in carpentry?

The three primary types of wood used in carpentry are indeed softwood, hardwood, and engineered wood.

Softwoods, which come from coniferous trees (like pines and firs), are generally easier to work with and more readily available. They are commonly used for structural framing, decking, and furniture. Hardwoods come from deciduous trees and are typically denser and more durable, making them suitable for high-quality furniture, cabinetry, and flooring. Engineered wood encompasses a variety of products, such as plywood and oriented strand board (OSB), which are made from wood fibers bonded together. These engineered products can offer structural advantages and are often used in construction and cabinetry due to their strength, uniformity, and versatility.

The other choices do not accurately represent the primary categories of wood used in carpentry, as they mix specific types with broader categories or include materials that don't fall into the primary classifications traditionally recognized in carpentry.